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Case Report  

 

Epidemiology of Aortic Stenosis 

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Moderate or severe valvular cardiac disease
are common conditions, become more prevalent with age, and adversely affect
overall survival in the general population. 1 Of the valvular heart diseases,
aortic stenosis is the most common cause of valvular heart disease in the
United States. 2 It is more common in the older population and the prevalence
rises as people age. Among people 50-59 years old and 60-69 years old, the
prevalence of aortic stenosis is 0.2% and 1.3%, respectively. For older
patients the prevalence increases even further with 3.9% in patients 70-79 and
8.9% in patients 80-89 years old. Most of these patients with aortic stenosis
have either calcific disease of the typical, trileaflet aortic valve or were
born with bicuspid aortic valve, which is prone to calcification. 3, 4 This
is in contrast to people in developing countries, where aortic stenosis is more
often a result of rheumatic valve disease 2, 5. Overall, aortic stenosis
affects about 3% of people that are 75 years old or older in the United States.

6

 

The Case

Our patient is a 67 year male with a history
of severe intellectual disability, non-verbal and non-ambulatory at baseline,
bed bound with kyphoscoliosis and severely contracted upper and lower
extremities. He presented to the emergency department with a 3-day history of
nausea, vomiting, abdominal discomfort and diarrhea. A CT abdomen was obtained
in the emergency department which showed a cecal volvulus with a massively
distended cecum measuring 8.5cm in luminal width, for which the patient was
scheduled for emergency surgery.  

 

On arrival to the preoperative area, the
patient was noted to be thin-appearing, and lying in bed with severely contracted
extremities. Airway evaluation was limited by the patient’s non-interactive and
uncooperative nature. The cardiac exam revealed a prominent grade IV/VI
systolic ejection murmur across the precordium. The anesthesiology team ordered
a STAT bedside transthoracic echo (TTE) as further assessment of the patient’s
cardiac function was crucial in developing the anesthetic plan prior to
proceeding to surgery. The bedside ECHO was also important in guiding
intraoperative anesthetic management of the patient.

 

The anesthesiology team and TTE technician
reviewed the TTE at bedside and found that the patient had moderate aortic
stenosis based on a peak gradient of 71*. Therefore, the team proceeded to
surgery with the understanding that the patient had moderate aortic stenosis.

Of note, a later interpretation (after the patient’s operation) of the TTE by
the cardiology team revealed that the patient had low-gradient severe aortic
stenosis with preserved ejection fraction (EF of 70%) instead of moderate aortic
stenosis. Since the Cardiology interpretation of the TTE was obtained at a
later time, the team proceeded to surgery with the thought that the patient had
moderate aortic stenosis. 

 

When the patient arrived to the operating
room, he was induced via rapid sequence induction using rocuronium, etomidate,
propofol and fentanyl. Rocuronium was used instead of succinylcholine because
of concern for hyperkalemia in this bed-bound patient. A total of 50 mg of
rocuronium was administered for induction as well as 10 mg of etomidate, 10mg
of propofol and 50 mg of fentanyl. On induction, 150 mcg of phenylephrine was
also administered to maintain afterload and systemic perfusion in the setting
of moderate aortic stenosis with use of vasodilatory IV anesthetic agents. The
patient was then intubated with a glidescope given the limited airway exam. An
arterial line was then placed to continuously monitor blood pressure in order
to guide management in maintaining afterload. 

 

Overall, the entire procedure, an exploratory
laparotomy with right hemicolectomy for cecal volvulus, lasted for about 2
hours. For the first hour of the procedure, the patient’s blood pressure was
labile, ranging from 215/100 to 90/75 with mean arterial pressures of 99 to 148
as measured by the arterial line. Phenylephrine was administered during the
procedure to maintain afterload when the patient’s blood pressure decreased. By
the second hour, his blood pressure and mean arterial pressures had stabilized,
ranging from 180/80 to 140/70 and 100 to 150, respectively. Throughout the
procedure, the patient’s heart rate ranged from 55-90 and oxygen saturation was
maintained at 100%. After surgery, the patient remained intubated and was
brought to the post anesthesia care unit where he stayed for 3 hours; after which
he was transferred to the intensive care unit where he was extubated on
post-operative day 1.  

 

His post-operative course was complicated by
acute gastrointestinal bleed on post-operative day 1. A few hours after
extubation, the patient had 2 episodes of hematochezia as well as coffee-ground
emesis in his nasogastric tube. Additionally, hematocrit decreased from 32.7 to
21.9, and the patient was noted to have symptomatic anemia with tachycardia and
hypotension. He was transfused with 4 units of packed red blood cells and
brought back to the operating room on post-operative day 1 for emergent
re-exploration and revision of the ileocolic anastomosis. After the revision,
he was brought back to ICU and extubated 2 days later. After extubation,
he was transferred from the ICU the step-down unit, where he had a few episodes
of melanotic stools that self-resolved. After 6 days in the step-down unit, he
was then transferred to a regular medicine floor where he remained until
discharge home.

 

 

Sources

1 Nkomo VT, Gardin JM, Skelton TN, Gottdiener JS, Scott CG,
Enriquez-Sarano M. Burden of valvular heart diseases: a population-based study.

The Lancet. 2006;368(9540):1005–11.

 

2 Czarny MJ, Resar JR. Diagnosis and Management of Valvular
Aortic Stenosis. Clinical Medicine Insights: Cardiology. 2014;8s1.

 

3 Eveborn GW, Schirmer H,
Heggelund G, Lunde P, Rasmussen K. The evolving epidemiology of valvular aortic
stenosis. The Tromsø Study. Heart. 2012Feb;99(6):396–400.

 

4 Merryman
WD, Schoen FJ. Mechanisms of Calcification in Aortic Valve Disease: Role of
Mechanokinetics and Mechanodynamics. Current Cardiology Reports. 2013;15(5).

 

5 Novaro GM. Aortic Valve Disease. Current Clinical Medicine.

2010;:96–101.

 

6 Stewart BF, Siscovick D, Lind BK, Gardin JM, Gottdiener JS, Smith VE, Kitzman DW, Otto CM. Clinical factors associated with calcific aortic valve
disease. Cardiovascular Health Study. J Am Coll Cardiol. 1997;29:630-634.

 

 

 

 

 

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